Toothbrush



FIG. 1 is a left side elevational view of a toothbrush showing my new design;

FIG. 2 is a right side elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a front perspective view thereof; and,

FIG. 6 is a back perspective view thereof. 

The ornamental design for a toothbrush, as shown. 